Results 141 to 150 of about 11,697 (215)
AGN astrophysics from comparing radio and Gaia optical astrometry
, 2013 Gaia will open up a huge volume of new parameter space in which to explore the physics of AGN and black hole evolution. We address the question as to how far along the relativistic jets blazar radio, optical and gamma ray emission originated. In some models the optical centroid wander should be detectable as the relative contributions of thermal and ...
openaire +2 more sources
How Well is the International Celestial Reference System Maintained in Official IAU Implementations?
The Astronomical JournalThe International Celestial Reference Frame (ICRF) based on the VLBI-derived positions of 608 extragalactic radio sources was adopted by the International Astronomical Union (IAU) in 1998 as the first realization of the International Celestial Reference ...
Zinovy Malkin
doaj +1 more source
A Tri-Band Cooled Receiver for Geodetic VLBI. [PDF]
Sensors (Basel), 2021 López-Pérez JA +16 more
europepmc +1 more source
Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. [PDF]
Sensors (Basel), 2022 Raut S +5 more
europepmc +1 more source
The Gaia space astrometry mission: status and complementarity with radio astrometry [PDF]
Proceedings of 11th European VLBI Network Symposium & Users Meeting — PoS(11th EVN Symposium), 2016 openaire +1 more source
VLBI Astrometry of the Hipparcos Link Radio Stars [PDF]
International Astronomical Union Colloquium, 1991 J-F. Lestrade +3 more
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Challenges and opportunities for time-delay cosmography with multi-messenger gravitational lensing. [PDF]
Philos Trans A Math Phys Eng SciBirrer S +4 more
europepmc +1 more source
Exoplanets, extraterrestrial life and beyond: an interview with Douglas Lin. [PDF]
Natl Sci Rev, 2022 Xin 辛玲 L.
europepmc +1 more source
An X-ray-emitting protocluster at z ≈ 5.7 reveals rapid structure growth. [PDF]
NatureBogdán Á +3 more
europepmc +1 more source